Again I'd like to say thank you all so much for not making me feel ridiculous. I've been out this evening and come back to all these messages.
Some of you raised points that my DD does too that I'd not mentioned, like with food it seems to be either an obsessive thing, or a texture thing rather than fussiness.
She can never seem to sit still, ever, no matter what we try and get her to do.
I think I am going to raise concerns with my GP, I now feel like perhaps I am not worrying over nothing, and that just because she isn't presenting in a typical way, or the way I am used to, it doesn't mean that she isn't presenting at all.
I do feel as another PP said, that there are at least some sensory issues. DD is 2 years and 7 months and is the only child I know of that age that still likes to be swaddled. Along with the pain stimulation ( I really do feel thats's what it is when she wants to be smacked etc) I feel I at least have cause to raise a query there.
In regards to lack of empathy, I agree that it's not a 'typical' sign in my experience, my brother is exceptionally empathetic, and so is my DD, she borders on ridiculously so, crying when cartoon characters are crying for example, she gets furiously upset when they are. It seems overboard to me, but for her it seems to be entirely natural.
I feel a lot better for talking to all of you and seeing your personal experiences. Thank you for sharing them with me.